<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>内容</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <script src="js/jquery-3.4.1.min.js"></script>
    <script src="js/bootstrap.bundle.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
</head>

<body>
    <!-- 
        内容:作为了解就可以了
     -->
    <p class="h1">h1. Bootstrap heading</p>
    <p class="h2">h2. Bootstrap heading</p>
    <p class="h3">h3. Bootstrap heading</p>
    <p class="h4">h4. Bootstrap heading</p>
    <p class="h5">h5. Bootstrap heading</p>
    <p class="h6">h6. Bootstrap heading</p>

    <h1 class="display-1">Display 1</h1>
    <h1 class="display-2">Display 2</h1>
    <h1 class="display-3">Display 3</h1>
    <h1 class="display-4">Display 4</h1>

    <img src="img/1.jpg" class="img-fluid" alt="Responsive image">

    <table class="table">
        <thead>
            <tr>
                <th scope="col">#</th>
                <th scope="col">First Name</th>
                <th scope="col">Last Name</th>
                <th scope="col">Username</th>
            </tr>
        </thead>
        <tbody>
            <tr>
                <th scope="row">1</th>
                <td>Mark</td>
                <td>Otto</td>
                <td>@mdo</td>
            </tr>
            <tr>
                <th scope="row">2</th>
                <td>Jacob</td>
                <td>Thornton</td>
                <td>@fat</td>
            </tr>
            <tr>
                <th scope="row">3</th>
                <td>Larry</td>
                <td>the Bird</td>
                <td>@twitter</td>
            </tr>
        </tbody>
    </table>
</body>

</html>